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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d820c913a1edaf9d12c7054cce611df0701791ecf82f7d758af3735c6a9247' 
  AND token = 'iRnVtzm4fUT5gXzV2nUXFDXm2zTJ2JoZpM78z6t0984=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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