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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80e5fdbd514860cf20a86da221b4f1892c2128448af4f9bfb00e05d35fd8cc0' 
  AND token = 'QjIqywRttFkDb64s63yPL2GVc4PluTZ/0zh6qLqFVro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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