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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0f031fe4a543478da015ae8a32cb3ca9284e956dbc767324d9c69f5d5d153b' 
  AND token = 'llw6iixcWSycLLQF1dbZwivnen1xeYOxriQsB+zmEzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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