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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3035c2fdbddec5e81df7dbf2cedb0b9c96af4212eda29f46d809b2b69a8985ff' 
  AND token = 'PkW8hI6oKhvP+9TdqYoIvgK6Li3v+oxvbKqAeeCA8K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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