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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928cda79c9c995694825b5394acf281f140e86dc8cea2d3e0afbe0a78a212cd0' 
  AND token = 'ch94KmwIbqLXaZWChfmc8jw4Mvd1sCGW8RAtnhEP6Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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