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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4392c9ef132d206434ae4143be868bbbd55a3e1bfbf51e993ca9eee8239dfc03' 
  AND token = '6+5cOeI4mCZWMia8rp5N5l08L7xxV4Zt/t73mDAWqrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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