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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8718836d6af3b9f6d4867d23c48f3105bbbdf4403a3ad27dcfdeb1ec945757e1' 
  AND token = 'jd+thTRt4ccd6V7ROP5co1z5DgJKsuJ5lmPgpK5t5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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