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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1b15dbbaf60808df26b1fc087d748ae66c7eabff78606cdeb1a41804bbff19' 
  AND token = '+RXHpiUOogO8WmYRrW3gyxEj9+mHn3brrMzexsXfNLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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