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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24aab430e80974a8f3d711c4b6b4efe64e53488462661194a32f3a15946dd5b' 
  AND token = 'daXzQjch9iT5izX44904a+sql+Whw+l8CS4K0ZGP/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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