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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e17d01b44efa2f10974b85df494a33b0951a8be89af2b5f379be1dc970631c1' 
  AND token = 'CzajW34KQUtKyNitNLyEay9GMpgEzUGXkie9US5O+ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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