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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca88f9a10a3207d53bceb41e97174c78b92ddbf3d4579d9aeb6643b1f6c0739' 
  AND token = 'xj8IFK2zjjJai8ykbL7xDIaCNouGU47VqheP3SxZs2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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