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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a08713cf02a3c675d1c6e823aafa34d365d3e7620d058370a2f8cdd10799d9' 
  AND token = 'cwKz71mWWODunTMNlnf3GPUqOqRMP9rldLYXUs3esIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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