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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ade9a81fc8d8a07e5dbea1c1a6ae80c35023fa0d557c4b349d00a054cec5fa8' 
  AND token = 'IKJh4ndkUmbXCTOIV2iCXM/PRZhSKYOfiF/boYEvgzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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