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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2920683ab918b62e4ec295b4a5c90faa1380fd5fa70f9a62bf809ed5833238d5' 
  AND token = 'Fmtbx+V6XlWTDnxf8OdvBAjq6/DqE9p6rCLMQiMcVrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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