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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e23140ec7db4797dd0c8592f839b8b33f12951e0069143a817ba8ca095ab7d' 
  AND token = 'Xd+14psklNlVrPqH6b9nqgxtlWBsWhbia3u2DCfHCRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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