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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee15f6ce5a9c24abc2734f8bba0fc5496800ba4fe1f1f7c9b4d1ff7ad5a3e59' 
  AND token = 'Q/+H4zM2EE/z/4+dOMQIBWBrwQX4bo5s5QOT4Gi4X7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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