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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452482dd9740717c7e1a87956e6238bac6ffd8bb00b5cc77eeb9cfdcacd201a9' 
  AND token = '/taNLVKFmc4AXEJN9wAiWiaSrKrJmZl6P831HMcWRDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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