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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3469f1869653794a12096bb5f7c0caa47722a2b1d91b3cfe3fe5cb0fa8d7fc' 
  AND token = 'Mau1R7c2snQutqTEKM61X87DIWZeCf4sE/RF9jAitdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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