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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b33e068e30508f3183a283b10b62d109baf8cb2ed4f88dbff3316267834b7fe' 
  AND token = '8XYzQZIejo4iCMOkn05D0v4hurBXdGPPcd27pWtZf94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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