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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a429c3cf85641d3143d0fbd017bb9a15ba1190df0e334eb66d25ec6190c82f' 
  AND token = 'SCQ+lsvnvtUN5tBZA8AMB7Ot3PfRFCEQma11q581PI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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