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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee689b13106586696c0eb901493dd1f8f75b4b9e9c7d61ce399a08ed3b60f7a1' 
  AND token = 'ewfqF9ljFHckx76eZJkuzgNzdDwB+EI6s0kArZqy+UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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