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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c900c6df32eb3852d8fb0f7ec09560ddf2bf86655096467f91a195b73fd263' 
  AND token = 'PZur9byXPpbFCJf+2mcujDXMKgmn+4aEfHu2l9PngUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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