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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63eb3f5a50194e74dd23421fd55179737fff04b17b7a92a3458e606a35102f1' 
  AND token = 'Rxi5nty4Ev4ZRRMIGkrWZLad+WjV9gZynSgNY/M2jQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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