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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cd907d5c38d2e6a43c57c971d12f8f4b9bb5b6ef28880bc228e1440ca9047f' 
  AND token = 'co+oApmdY87pd8PwAHDlh89nT5V+Vg2JsBYrXGpnY1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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