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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eacaf49ce0e6ea4f60d89fab7a34308e6667828bf70f43458e84b9bf9bcf925' 
  AND token = 'SjYXcIlPyk25LzOY7QjKUT5sA7w0U3nepDhFNjpXpbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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