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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e39e6de7653552af541c02c1b348ab193e42558ca83bf2e2a3f6113e9e32ae8' 
  AND token = 'GpNsUqw3d4vb7gY1GZySYOsAZQMpRowS9Hy6rOnI7v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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