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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c657fb1b5a2540b0596d114fc5c61d3d9b5e17e821322581ae2b84fef08d13' 
  AND token = 'vDDat+W5DTxtEnnZoFVaFRCVg1Css2OI3Rz4Tk5OZIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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