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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4fb227223a3ed6ef23d9685d88b4f9d4f686f2d096dd0f3eba1bb8de384c3c' 
  AND token = '3cV4MovTpNEF8irIfB/bB1sI664JXqoW8/YZNxxAG4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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