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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633b782781f99ef720dc10ff570ac058202014c531e14fca58679245cd9ee119' 
  AND token = 'CmnEFD1fyzziSWC+88CCPM73wHGg4DQeg8q8L+L0RM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}