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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d10aa5b7950dfa5011c8a9f928da950ee5188208b1dc4e9aa574131bbd4e98d' 
  AND token = 'PYZiSVIbyawTGfmQXrp3B/Pgp5cshqi0zrkxHEta2Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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