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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5202ff7d07a69a97253929dba058d1d8ea0d6581aa850fc89fa2ab11a1b3849d' 
  AND token = 'Vt3PlwrhHjKOJswvpCtDGSGrrhhrbmXEiNFuydg4lsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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