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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44d092d52cbbd0f03eb728d588201802d26117d28f81197e61c72419dc88768' 
  AND token = 'aXDOvl9hJlKShp6Vxy2uW5RITdEyh3rNXyeo0gwGdxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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