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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c0bd96627d332b5dd1f5c6069f135c8a5aaf5e776b1f09e8c6aed631e938ff' 
  AND token = 'SWzECc98xok254ajAVoz7mn0YR98roi0MpiwejhwVVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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