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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122a9c37ce237c6f6eecce3e4314123176c27096533dc18e8262593044211ba7' 
  AND token = 'w5J+5O1FFSogWfVaTWNaCEc9TdotBI3c5iVeehaKvgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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