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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2235c4b92d19f740af3431384421deb3ae7cbfeb02fd6a4cc2334aeadce24bf1' 
  AND token = 'SiL1aBteJ68psHCvwWFa6okLzbDEwgM6aqGP9vImBcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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