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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5677ae983eb39f8e73cf84ddb3e9a2f4f9b2405bccbb0ae39f9f1050ee3bf9dd' 
  AND token = 'FvOqlbGgYFyRexQ2xp9d3fdjscPrw6lsFZ8WxjDRVks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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