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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be6ba458cf9d6871f5e68a6bbe51124e15e6ac7c643ef55a6f946f1cbd3488c' 
  AND token = 'jppaw8BByTS8fIY4lCiwSgZdsxU8D4H5rQlksRIe4wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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