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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a77652603e4357010a1b79b17d9dbc73b800d095b643de583d4059bdd9cbe6' 
  AND token = 'yw8Eb7VSKm1YJ1CWFQgIzU/L6kUSUueu03l7F9LOUJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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