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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4babd249ab86305740914aa87f36c1e85ab7558abedfd6e96be9a166b51cd13' 
  AND token = 'WvUdtZIyxqFvXbFz8JzaunoyNWWqSrm1ue58M0qwhq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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