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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b483b68c79484e93ac57c4d963011cc09ad94d68d691140eadc6bcc0460b5d' 
  AND token = 'ZEIUSWsE0ZjOg1vU5Ebp3X0rq/6H7HLD7ceLfi72bwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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