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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfa37f77a09c8cacca21e2d7fa52cd74ca1e783e832e9fc6cfeff1f1bc31f8b' 
  AND token = 'YWUqQz6rV9Xz4rA45WtkmBd3ZqhBxgJHOpugffBpE7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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