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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30843d482b47810490935efff1d0ab70d4f8c37ffce803002de9453b9eb1efa' 
  AND token = 'mDD83IMFolWJxry0PnCfUaLyS8w32hSG4eMznNjIb74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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