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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc003d764a9cf1acf6a08ca6d01a00c8de4708e9e34c97b2cad1232f85582819' 
  AND token = 'F3jNBI2QrS5eCP8xno5x/ZB5G3sgCJpT100C3yEPeIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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