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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5fc65a5076377b4629baf2dbcd85d32a6507175f62d1bfcfaab6be05ab8bb6' 
  AND token = 'yqO7yTPpNQPgcWs9zIRmqJPoyGISXvkhuI6L2cXfAEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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