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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da3f8a3bebf2ac2d62eb569e512a7ca1ab4c59fdd594ffd7ffb359d0d11ced3' 
  AND token = 'F3JIwiZ97el9hCbdO5xNAanE3lnBEEM2ThEg1CWOMwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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