SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a338823a2917c1e349fbbaef5ae92003c8d04d1fb3959e64bcea15abcb4f6959' 
  AND token = 'iRr6Qvxzv7SFKICUON+UJPEZ9vn6s5JXYRVnv9UPx7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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