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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0dea52cab6b56323374c0430bb32f6e79b33d6e292a9d43ec18aeefdf389bad' 
  AND token = 'abPgshucDf5xRuXdeOBHxePP2G+HUSZpiqSv9w+d4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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