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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc85cd3fb99d7c9becace2116b0b0514c420c9114ab48efe6977ce6cace362d3' 
  AND token = 'e1HbzRYIj7ZFd9/2T/8EqC7aF1YzB2i9WY21RXvvUNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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