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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac26d2ab9573146b2b652d0a66d282dcb8d6d70ce9ee6e622c4f11c710850e41' 
  AND token = '3b/cCgqzGY3HO5NGdrni3K9W2CXUacjp2o9ycAUurLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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