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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e77e2ce8ba21f7a8ef60b2cc5529103357d2b5275384dc5555f806d87e9935' 
  AND token = '5tdUr9azBb+lOYwP9oWjHt3V2jXQVIC8ibDoU3BjsIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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