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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b39445072b48d82d37c8bcc7d92cfd81bdcc84502a1ffcaea1cec43ae8b8d3b4' 
  AND token = 'uN9U2ozmd+gnx+AvOqk1dxFKGT8tbF5G5IwnCePMjnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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