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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf8e1344916c3cfc393f9e3d0d53a9de4d7b56afb5c649ef7d036177558c472' 
  AND token = 'pivxjn5OlcetMnxLSpUuMZv5zlShMvvmqWPlLwT8n3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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