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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4ca0c33b89b749ca04c71a99deadef3482eeedc0f63bfb3ca0153c0b8da1da' 
  AND token = 'gmwqAK0W+CKUcTJz8gxlyJlx/8Lr12aGxamZDb+CB04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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