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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d77f03456db5e5fd308ee9d3f164fe21b7fcabee6f3c8ba3778531d6552a37' 
  AND token = 'QBuc0TqTaA5zE/PeLTkjE50FIupBmkzzEjvnEMVl8JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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