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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f8a55cb42b02339484c17bbed245e3ca43c1c575b19d6b41c780d11d1a2cd5' 
  AND token = 'KY3nyx80af0rQCq0izmKnp07YEBkuXwXDio5SsAUV2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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