SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb518e7d3345330f2cbe03c518141de84b4513bfe32c27abe6925b57a2d367e' 
  AND token = 'mXg760nTQusVo/3pq9ZsTpPhSQAGBYCBiFjup8KSWNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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