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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28f6ac6a640c493884e6c0a813c2282cab6615a269cc6efa6b2fc243b5475dc' 
  AND token = 'B3QYyMmv9MKPfNHuMxG6VW//Y5D0zZlueymrR50gHQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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