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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893e0a140dc74a6cac0c12dab98315d564a6dc78d096ba63ee04d77743d51fd1' 
  AND token = '1vK6Nnr/eWFwNTpR6mloJiH66yOViFILsxvf+qZv3i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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