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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9516b4a43e6cc49783bea9097ddfc0b35ac3f968f69a40740a8705d463cc055b' 
  AND token = 'auAQjU8R2slUL3RITKrfuV0TX3hrF9EdVFaJdjEfyCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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