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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42fe65abf3532f1c70f559d540c1cea2bd0b45229761a45f54df24cd137e5f5' 
  AND token = 'Vv1zVSsWIyZJDY06130IF/FLrSrv8cReFqKkh7GdkAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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