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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebb6e5fd053d9c92e14fa0cffa745606405a06e4b88554a930355cf9a17cb8c' 
  AND token = 'JGVk3P7IOStKniDTEBB/+mT5tznKeLA3t3qghJa++Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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