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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e08075d20cb13a5c31aad5d874136de8806e14fcc82fcd1ec8783f8d6f89da' 
  AND token = 'BJ5rO72slx2cvn0b8U7MVroy9yFZ7f75tKewcVIyUMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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