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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b771e53ebd1b23516734b48a5fa8a54f72fa19983fcdc2a53b1f72e266e6197b' 
  AND token = '45wNYg5jgFu9FohSIfQkfoWLu5XNSQ/2vJpjdApI6lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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