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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a345b48b600123071e7cf33ef51bac0b487dea1cd3a21489f31ffe0eca36a3' 
  AND token = 'GIdCC7zOhmcn5Gw1xhLsx47SPhesJgXKjV2P7Li2vQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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