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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0769aacd806ea9dea92ee8f030ae8cd5c7dfbd1e83fa0e37bbeb9f440b92c6' 
  AND token = 'JugtNp/6/fRsVdO19ObIrWoRMzWu4lkPf9IGi8L1UN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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