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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0dbb8fdc823414b9eceba2881fdd7212ad072c3aa97d0d06b569a8232aa939f' 
  AND token = 'DMp6TuU0mbmSTmjd2ZeoccbKtJWj6Ur63+L7pVJBoao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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