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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b7584b88f063ad77101ea78d124b96982d653752e8701f970233092191e2cf' 
  AND token = '6bAanOCvbS03RogIo1+a1hUysae1hQN+1xkXE6lGh0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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