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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20768bb938598ec36f9a6957a7c7087cca824eae7dbfa4693f93af736f374897' 
  AND token = 'eQgabUhwHBPWQ+9WBzokmA2OksB3zItR8ZNsZ4T3/6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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