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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac7172857c53657c3eedb62b7158718dd2357a28a4759147fb6b8c9ce9bb712' 
  AND token = 'FQ/DgwRpI4OYbMF8MxRkj4bPKTppB2UcJRVqrQtgQ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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