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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba308584ee8d4f2ff0fbabaa7a2d3aeb4ab48ef843ce44b4791d2f0c37a5a40' 
  AND token = 'L/QI9+vBFhy12AXZBPms2EVQlbhyxwXJ+qLTR5dDNTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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