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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7045fd6ecfce5694d1c25c40e04067b56f9374ad8517e328d53c27d055a3fe26' 
  AND token = 'jcHU394DSdp6ZE55miQz4f73MH9lfMo7ckIOCZNYnRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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