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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98c6f2872fa1b08697e7b08a81f3e1fd52f1f778d4ff4c4fc9362629ff43fdd' 
  AND token = 'jZ/UBJb0URPWuYREuBmEza0HuFJXcaAxw4rEWQ8mWZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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