SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca8cba34d2f5d1c836cbf170f2cf9e6b6ef9224b9a4a4529cb88231136f9197' 
  AND token = 'aMwU8KB5q3/Lg3R9nbBHvdh5zVG5eI7MdB60x+mFMl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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