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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2c30c8fecae76b254e94b37e565fed2f115ac8401e8ea97d6adb153dce0018' 
  AND token = 'd5Lc76PdlcwyFGTSoyIg7IlN/71zdcn76pR38QC5sYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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