SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e65f44db241e11d83578d25763f677bf2cf60b142f12b4503b18f177db059798' 
  AND token = 'v+jzBJ+lERvwokqpg+Jg3d21l9Euh/W1j4fcrBUCrPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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