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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd61bee4a3f721eeb62d30e5ebb81970b84e0c9795e0b84363fb2f4f62cedd23' 
  AND token = 'HCbrf1FJ8c6DISyxan1jDb1+CtY2P9XePodNPmJIBSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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