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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4baedf1c69b95ed38b383fb4e2cf353e69d8c247c68db0df5fa9b09bb47d2286' 
  AND token = 'HgCxz6xnigaRYjjDHY/3/Z4xbDZ9ZVxc1L9RC67D/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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