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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91b2d180874d4cc42e2141638f25264e976399fe89d2045fd9bd436b20bb9bf' 
  AND token = 'Tz/+w9wf1+v2K2HbcaXcyuzf7e9d3L6QDgTUaNhE3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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