SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af37e7165de197bbd67e553235871a864a073bf21a324b29c23fab59df6f2a63' 
  AND token = 'HBCJb6o3zRwbAs4jizyvO9W92vVvolIKyYQ/LltQ/U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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