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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd851229a742c54fcd57d8d074c4ddafe5676a54a39b956d28ea0580c762159' 
  AND token = 'Ml1N7kaGrBpv6t73r8nKJN1+PTzjsDXrYmPEYPmsl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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