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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b55f39d348dd6151f43ffec8a692527d596ad41d25f4e26164b77d30bcb334c' 
  AND token = 'Zm+kkcu6V6orX/e8KCkpI1ffzq+MJUxoAN5iZXEpLEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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