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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be5d3041c82ae608665c4abf14f56eb15d9802438e04bcde33a356fcad67ea6' 
  AND token = 'YrN2RMPLmIbz8HqPwqZT/9t1KpealX9LWZ9LbQU27zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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