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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7698ee933cd5ee37a9cc3a8642cc9f41d8f05fed1df60e11070772ab6be0a6f8' 
  AND token = 'NkOZ30XNqTfcbO0iTFPtDWqzVzVDj1JV8iI1PpWRNms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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