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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382331945ecb085d7564f673958d6e763e530bce335c4ae030c69e625be244e7' 
  AND token = 'heVr8Za0oEoXAT4z+Mmtk1IiKMoZ8yBsbed09WDr7TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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