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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578dba5caae988d76a4f6f2be43c7b796842137e432eb6c33cb4c45986231184' 
  AND token = 'f2IetxaYruG+0oujip/RNnHHuppF/6eIZYO/EXIk0U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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