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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e038d239af62b7e9583872e40843592989e5b0bab3f5cac62c803bc317aef2' 
  AND token = 'wwC8vTacWlNTPw+PD2MbIjE8O/0rXa0TUj/Hdtq42V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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