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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f71a4d36bef1b223c68648a9a20c264b357a42b8c36bfd6bf4ea784ac6ccff' 
  AND token = 'dJ5zry5fK1Ka0RHn3fjdJKF7vSvSsnbTbl/QmG/TJzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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