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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45de886e50dcd8e8ef531c85423d140999816f433fe5392c5bbd2f55c3d5477' 
  AND token = '2dz4mI6qj+1Z+lPuQEqvxsy36bWo66wGTzWZbf6H9c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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