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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999fb9758311f1df19c801ae70c4acf88c49d621ece9fa578d3fcebfc8258abc' 
  AND token = '+8AZbcuK+Vhw85lnExHOuPHjTu2hO/7ef0naldNnhKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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