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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1beb53c69274d575cece14c62767131f8ca361bfef3eb9b70f6dda10605f6d6' 
  AND token = 'MLPQES5iIuPLkMEKKU1hSJKyIss1cc33ofeRXtAquM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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