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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbaccc290c76b037a1931cc55fb7c38a860f9379923f4fbbd2fdf8707376caa' 
  AND token = '/jQ55bdGsbGWg0L7WeVF48DBEqOSMT+MGUWuIprCyog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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