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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f45eab9988db01a5b8f7a28629029ee0afd611a91352f9e59308a28d93596fe' 
  AND token = '7rL8o4EPpAYTfS9S5bq31siIvDI8vlnUy2N+OHjh5R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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